var $=function(e){return document.getElementById(e)};
var Demo=(function(){
	return {
		execute:function(url,form){
		    function cb(data){
		    	var o = $("backJson");
		    	o.innerHTML=JSON.stringify(data);
		    }
			new xhr(url,cb).setForm(form).execute();
	    }
	}
})();